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+// Scilab Code Ex5.2 : Page-168 (2013)
+clc; clear;
+h = 6.63e-034;    // Planck's constant, Js
+c = 3e+008;    // Speed of light, m/s
+// For a moving ball
+m = 0.057;    // Mass of the ball, kg
+v = 25;    // Velocity of ball, m/s
+p = m*v;    // Momentum of the ball, kgm/s
+lambda = h/p;    // Lambda is the wavelength of ball, nm
+printf("\nThe wavelength of ball = %3.1e m", lambda);
+// For a moving electron
+m = 0.511e+006;    // Rest mass of an electron, eV
+K = 50;    // Kinetic energy of the electron, eV
+p = sqrt(2*m*K);    // Momentum of the electron, kgm/s
+lambda = h*c/(1.602e-019*p*1e-009);    // Wavelength of the electron, nm
+printf("\nThe wavelength of the electron = %4.2f nm", lambda);
+
+// Result
+// The wavelength of ball = 4.7e-034 m
+// The wavelength of the electron = 0.17 nm